Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Tesla
TSLA
|
+$33.5M |
| 2 |
Netflix
NFLX
|
+$22.8M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$20.9M |
| 4 |
TWX
Time Warner Inc
TWX
|
+$18.3M |
| 5 |
Alibaba
BABA
|
+$15.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$71.1M |
| 2 |
Micron Technology
MU
|
+$43.8M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$26.3M |
| 4 |
Booking.com
BKNG
|
+$22.2M |
| 5 |
Boeing
BA
|
+$21.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 7.87% |
| 2 | Communication Services | 7.14% |
| 3 | Technology | 6.23% |
| 4 | Financials | 5.5% |
| 5 | Healthcare | 5.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
FITB
2751
PUT
Fifth Third Bancorp
FITB
$52.2B
| $36K | ﹤0.01% |
238
+62
| +35% | +$2.02K |
|
|
HDSN
2752
Hudson Technologies
HDSN
$261M
| $36K | ﹤0.01% |
+7,456
| New | +$43.9K |
|
|
HPP
2753
PUT
Hudson Pacific Properties
HPP
$764M
| $36K | ﹤0.01% |
7
+6
| +600% | +$1.33K |
|
2754
Infosys
INFY
$49.5B
| $36K | ﹤0.01% |
4,116
-99,892
| -96% | -$885K |
|
2755
PUT
JetBlue
JBLU
$2.28B
| $36K | ﹤0.01% |
274
-1,715
| -86% | -$36.5K |
|
2756
Keysight
KEYS
$51.8B
| $36K | ﹤0.01% |
705
-20
| -3% | -$955 |
|
2757
PUT
Kodak
KODK
$798M
| $36K | ﹤0.01% |
167
-29
| -15% | -$186 |
|
2758
PUT
Lands' End
LE
$392M
| $36K | ﹤0.01% |
120
-124
| -51% | -$2.29K |
|
2759
PUT
M&T Bank
MTB
$36.6B
| $36K | ﹤0.01% |
134
+60
| +81% | +$11.2K |
|
2760
CALL
Matador Resources
MTDR
$5.66B
| $36K | ﹤0.01% |
137
-521
| -79% | -$15.8K |
|
|
NGD
2761
DELISTED
New Gold Inc
NGD
| $36K | ﹤0.01% |
14,020
-5,540
| -28% | -$15.6K |
|
2762
PUT
O'Reilly Automotive
ORLY
$76.1B
| $36K | ﹤0.01% |
1,620
-2,760
| -63% | -$46.7K |
|
2763
PUT
Precigen
PGEN
$1.91B
| $36K | ﹤0.01% |
280
+83
| +42% | +$1.19K |
|
2764
PUT
Rapid7
RPD
$656M
| $36K | ﹤0.01% |
+68
| New | +$1.64K |
|
2765
PUT
Sprouts Farmers Market
SFM
$7.31B
| $36K | ﹤0.01% |
106
-60
| -36% | -$1.54K |
|
2766
SouthState Bank Corp
SSB
$10.3B
| $36K | ﹤0.01% |
+425
| New | +$37.7K |
|
2767
PUT
Vanguard FTSE Europe ETF
VGK
$30.3B
| $36K | ﹤0.01% |
287
-157
| -35% | -$9.41K |
|
2768
PUT
Wingstop
WING
$3.72B
| $36K | ﹤0.01% |
437
+404
| +1,224% | +$18.6K |
|
|
BFX
2769
DELISTED
BowFlex Inc.
BFX
| $36K | ﹤0.01% |
2,698
+2,503
| +1,284% | +$31.7K |
|
|
TRTN
2770
PUT
DELISTED
Triton International Limited
TRTN
| $36K | ﹤0.01% |
82
+46
| +128% | +$1.54K |
|
|
NE
2771
DELISTED
Noble Corporation
NE
| $36K | ﹤0.01% |
+9,879
| New | +$44K |
|
|
CRR
2772
DELISTED
Carbo Ceramics Inc.
CRR
| $36K | ﹤0.01% |
+5,046
| New | +$43.6K |
|
|
MON
2773
CALL
DELISTED
Monsanto Co
MON
| $36K | ﹤0.01% |
698
-1,127
| -62% | -$136K |
|
|
LQ
2774
DELISTED
La Quinta Holdings Inc.
LQ
| $36K | ﹤0.01% |
1,947
-23,526
| -92% | -$444K |
|
|
HPJ
2775
PUT
DELISTED
Highpower International Inc
HPJ
| $36K | ﹤0.01% |
245
| – | – |
|
Similar funds
Simplex Trading's Q1 2018 Portfolio in Review
As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.
Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.
- Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
- Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
- Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
- Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
- Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
- Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.
Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.